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Spectroscopic Ellipsometry investigation of Oxygen impurities influence on Cobalt

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Abstract

This work is devoted to Co – O compounds’ investigation by the methods of spectroscopic ellipsometry. The article’s main problem is analysing information about electronic structure of cobalt-oxygen compounds in different structural states. Oxygen impurity was chosen because it is one of the main atmospheric gases characterized by high chemical activity. Co-O compounds were obtained by the method of magnetron sputtering on leicosapphires’ substrate cooled by the liquid helium. Process was provided in vacuum with gradual adding 2% and 4% oxygen into vacuum chamber. Samples were explored in wide spectral range E = 0,07–4,96 eV by the Beatty method. While an experiment was carried out the ellipsometry parameters and were measured near principal angle of incidence. The optical conductivity was calculated using these parameters as the other optical characteristics. The energy dependencies of optical characteristics especially optical conductivity were analysed. It’s proportional to interband density of electronic states. The appearing of new absorption band related to oxygen impurity in optical conductivity spectrum of Co – O compounds in amorphous and crystalline states was shown. Main parameters of position and oxygen impurity band’s half-width were defined for Co – O compounds in amorphous state.

© 2014 Optical Society of America

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